電腦detect唔到個webcam

我都唔明點解會咁
我裝左driver
插晒野
但一開webcam佢話
your video device does not exist
但係我個cam有內置mic架嘛
mic又用到喎
跟住我試過晒喇
應該唔係d isb port有事
咁平時插新hardware 入電腦
電腦sence到會有聲架嘛
佢就咩聲都冇
有冇人知到底點先可以搞到部腦detect到個webcam?
我整左幾個鐘都整唔到